{"id":"F2006L00757","name":"AD/B737/284 - Wire Bundle Chafing","slug":"ad-b737-284-wire-bundle-chafing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136780,"registerId":"commonwealth-F2006L00757-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/284 | Wire Bundle Chafing | 4/2006 |\n| ----------- | ------------------- | ------ |\n\n| Applicability: | Model 737-100, -200, -200C, -300, -400 and -500 series aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                     |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Carry out detailed inspections in accordance with the Accomplishment Instructions of Boeing Service Bulletin (SB) 737-28-1208, Revision 1, dated25 August 2005 to detect discrepancies as follows:                                                                                                                                                                                                                                                  |\n|                | a. Chafing of the wire bundles located below the passenger compartment, above the centre fuel tank, aft of station 540 to approximately station 663.75, right buttock line (RBL) and left buttock line (LBL) 24.50.                                                                                                                                                                                                                                    |\n|                | b. Damage to the fuel vapour barrier area located below the wire bundles, as applicable                                                                                                                                                                                                                                                                                                                                                                |\n|                | Note 1: For the purposes of this Directive, a detailed inspection is: \"An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.\" |\n|                | 2. Rectify any discrepancies, detected during the Requirement 1 inspections, in accordance with SB 737-28-1208, Revision 1.                                                                                                                                                                                                                                                                                                                            |\n|                | 3. Adjust and replace, as applicable, the wire bundle clamps located aft of station 540 and install a protective sleeve on the upper bundle of the bundle run at station 616, RBL and LBL 24.50; by accomplishing all of the applicable actions specified in the Accomplishment Instructions of Boeing SB 737-28-1208, Revision 1.                                                                                                                     |\n|                | Later revisions of the above SB, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2006-03-12, are considered acceptable for compliance with the equivalent Requirements of this Directive.                                                                                                                                                                                    |\n|                | Note 2: FAA AD 2006-03-12 Amdt 39-14476 refers.                                                                                                                                                                                                                                                                                                                                                                                                        |\n| Compliance:    | For Requirement 1 - Within 60 months after the effective date of this Directive.                                                                                                                                                                                                                                                                                                                                                                       |\n\n|             | For Requirements 2 and 3 - Before further flight after the Requirement 1 inspections.                                                                                                                                                                                                                                                                                                                                                         |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             | This Airworthiness Directive becomes effective on 13 April 2006.                                                                                                                                                                                                                                                                                                                                                                              |\n| Background: | This Directive requires an inspection for chafing of certain wire bundles located above the centre fuel tank, corrective actions if necessary, and replacement of wire bundle clamps with new clamps. The Directive also requires an inspection for damage to the fuel vapour barrier area located below the wire bundles and, if necessary, corrective action. The Directive results from fuel system reviews conducted by the manufacturer. |\n|             | Actions required by the Directive prevent chafed wire bundles near the centre fuel tank, which could cause electrical arcing through the tank wall and ignition of fuel vapour in the fuel tank, and result in a fuel tank explosion.                                                                                                                                                                                                         |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n3 March 2006","sortOrder":0},{"sectionNumber":"AD/B737/284","sectionType":"part","heading":"AD/B737/284","content":"## AD/B737/284","sortOrder":1},{"sectionNumber":"Wire Bundle Chafing","sectionType":"part","heading":"Wire Bundle Chafing","content":"## Wire Bundle Chafing","sortOrder":2},{"sectionNumber":"4/2006","sectionType":"part","heading":"4/2006","content":"## 4/2006","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive targets a specific wiring area on named 737 series models to address wiring chafing found in manufacturer fuel-system reviews. It does not expand aircraft applicability beyond those models or add new fault types. Allowing later FAA‑approved revisions of Boeing SB 737-28-1208 as an AMOC provides alternate compliance methods but does not change the Directive's substantive scope or compliance timelines."},"complexity_factors":["Multiple affected models (737-100, -200, -200C, -300, -400, -500) increases fleet-wide coordination and record-keeping.","Inspections are defined as 'detailed' and may require supplemental lighting, mirrors, magnification and surface cleaning (Note 1), raising labour time and access complexity.","Three-tiered actions: detect (Requirement 1), rectify any discrepancies (Requirement 2), and adjust/replace clamps and install protective sleeve (Requirement 3) — sequencing and differing time limits create operational planning burdens.","Different compliance timings: inspection within 60 months (Requirement 1) but corrective actions must be completed before further flight after inspection (Requirements 2 and 3), creating potential immediate grounding/downtime for affected aircraft.","Mandatory reliance on Boeing SB 737-28-1208 Rev 1 for accomplishment instructions concentrates technical authority in the SB; later FAA-approved revisions are acceptable as AMOC, introducing dependency on FAA approvals.","Safety-critical consequence (fuel-tank ignition) raises regulatory scrutiny and limits operator discretion on deferral.","Physical location of work (below passenger compartment, above centre fuel tank, aft of station 540 to ~663.75, RBL/LBL 24.50) may require removal of panels or fuel-tank access procedures, increasing shop complexity and cost.","Enforcement and certification responsibility resides with the Civil Aviation Safety Authority delegate (signed by delegate), so compliance records and evidence of SB-based actions are required for audits."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 737-100/200/200C/300/400/500 series to inspect specific wire bundles above the centre fuel tank for chafing, repair any damage, and replace clamps and install protective sleeves following Boeing Service Bulletin 737-28-1208 Rev 1. Operators must do the inspection within 60 months and fix defects before further flight. The rule addresses a risk that chafed wiring could arc through the tank wall and ignite fuel vapour."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a tightly scoped, single-purpose safety mandate. It addresses one specific technical issue (wire chafing above centre fuel tanks) on one aircraft family. There is no evidence of scope creep; the directive matches its original intent of preventing fuel tank ignition hazards following manufacturer safety reviews."},"complexity_factors":["Short, single-purpose directive focused on one specific safety issue","Only 3 main requirements with clear sequential logic (inspect → repair → modify)","Technical but precise language (aviation-specific terms like 'station 540', 'RBL/LBL 24.50') that is standard for the industry","Single cross-reference to a Boeing Service Bulletin and FAA directive","No nested exceptions or conditional logic — compliance deadlines are straightforward","Note 1 contains a single defined term ('detailed inspection') with a clear, self-contained definition"],"plain_english_summary":"This mandatory Airworthiness Directive targets Boeing 737 Classic (-100 to -500) operators in Australia, requiring inspection of electrical wiring above the centre fuel tank for chafing and damage to the fuel vapour barrier, with required repairs and modifications (new clamps and protective sleeves) to prevent recurrence. It addresses the risk of ignition of fuel vapours and gives operators 60 months to complete inspections, but any defects must be fixed before the aircraft flies again."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-284-wire-bundle-chafing","history":"/api/acts/ad-b737-284-wire-bundle-chafing/history","analysis":"/api/acts/ad-b737-284-wire-bundle-chafing/analysis","conflicts":"/api/acts/ad-b737-284-wire-bundle-chafing/conflicts","importantCases":"/api/acts/ad-b737-284-wire-bundle-chafing/important-cases","documents":"/api/acts/ad-b737-284-wire-bundle-chafing/documents"}}